Reemergence of TSWV in a large scale in recent years: What's going on?


University of Georgia

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Southeast (GA, FL, AL)

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Since the early 2000s TSWV-resistant cultivars with some degree of field resistance has been the main management option for spotted wilt disease caused by thrips-transmitted Tomato spotted wilt virus (TSWV). This strategy has been quite successful, but in recent years, increased incidence of spotted wilt has been observed even after planting cultivars with field resistance. This prompted us to question whether TSWV isolates have evolved into a resistance-breaking strains? And, do they impact the usefulness of cultivars with field resistance? We sequenced TSWV isolates (all coding genes), and conducted phylogenetics and population genetics analyses over the last few years (2016-2018). Results are discussed below in detail. The take home points being that there is constant evolution of TSWV with respect to time, but no so much in relation to resistance identified in peanut. It could be that the temporal evolution of TSWV is an adaptation to TSWV resistant cultivars, and hence the increased TSWV incidence. 

Work is ongoing in 2018, results presented here will concentrate on phylogenetic analysis with N-gene. Ongoing work will concentrate on others as well.

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